MIL-R-93F
4.7.1 Visual and mechanical examination. Resistors shall be examined to verify that the materials, design, construction, physical dimensions, marking and workmanship are in accordance with applicable requirements (see 3.1, 3.3 to 3.4.3, inclusive, and 3.23 to 3.26, inclusive).
4.7.2 DC resistance (see 3.6). Resistors shall be tested in accordance with method 303 of
MIL-STD-202. The following details and exceptions shall apply:
a. Measuring apparatus: Different types of measuring test equipment (multimeters, bridges, or equivalent) are permitted to be used on the initial and final readings of this test, provided the equipment is the same style, model, or if it can be shown that the performance of the equipment is equivalent or better.
b. Limit of error of measuring apparatus: The maximum error of the measuring instrument shall not exceed the lesser of:
(1) One fourth of the initial resistance tolerance +0.002 ohm.
(2) One tenth percent of the measured resistance +0.002 ohm.
c. Measurement energy for electronic test equipment: The measurement energy applied to the unit under test shall not exceed 10 percent of the 25°C rated wattage times 1 second.
d. Test voltage for bridges: Measurements or resistance shall be made by using the test voltages specified in table XI. The test voltage chosen, whether it is the maximum or a lower voltage which would still provide the sensitivity required, shall be applied across the terminals of the resistor.
This same voltage shall be used whenever a subsequent resistance measurement is made.
TABLE XI. DC resistance test voltages.
Resistance, nominal (ohms) |
0.5 watt and greater (volts) |
Less than 0.5 watt (volts) |
Less than 1 ohm 1 to 9.999 inclusive 10 to 99.99 inclusive 100 to 999.9 inclusive 1,000 to 9,999 inclusive 10,000 to 99,999 inclusive 100,000 and higher inclusive |
0.1 0.3 1.0 3.0 10.0 30.0 100.0 |
0.05 0.15 1.00 3.00 3.00 10.00 30.00 |
e. Points of application of test voltage for initial resistance tolerance measurement (see 3.1):
(1) Wire lead terminal resistors of 10 ohms and less: .375 inch ±.0625 inch (9.53 mm ±1.588 mm)
from the end of the body.
f. Temperature: The dc resistance test specified in group I of table VII shall be measured at 25°C
±2°C. For all other tests, unless otherwise specified herein, the temperature at which subsequent and final resistance measurements are made in each test shall be within 2°C of the temperature at which the first resistance measurement was made.
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